[RCSE] Altitude stripes PDF available

[William Kuhlman]

   
The RC Soaring Digest article on bottom wing surface
striping to assist with altitude approximation is now
available as a PDF document.



The document is around 50K in size, so it downloads fast.

Bill & Bunny Kuhlman
<[EMAIL PROTECTED]>

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Re: [RCSE] Altitude braggers

[Bill Malvey]

> The point is that an unpressurized area of a plane is still not going to be
> at the same pressure as the static pressure outside.


These are all valid points and ones that I had in mind when I started asking
about the LoLo. I have one coming so I can get some experience with it and
do a little experimentation to see what its sensitivities are.

But, having said all that, at least we will have a real world comparison. I
assume that the Falcon will have a fairly accurate altimeter that is
properly configured. Once they land they can compare what the cockpit
instrument said versus what the LoLo recorded. Then we can begin to
understand the accuracy and precision of the LoLo.

I cannot wait to see the results. I love data. So much more fun than theory,
conjecture, and worse yet, anecdotes.

My favorite saying is:

"The plural of anecdote is NOT data".

Let us know what you get Sheldon - good or bad.
~~~
Bill Malvey

 


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RE: [RCSE] Altitude braggers

[Don Stackhouse @ DJ Aerotech]

Sheldon,


On this particular aircraft there is an Avionics bay that is not 
pressurized (at least that's what I think he called it). At any rate, yes, 
we would have to place the ALTi2 in an unpressurized area of the aircraft 
to get anything close to meaningful. I don't think it would do much good 
to check the cabin pressure ya' know . I mean, what the heck, at least 
it'll be "fun"...Much more interesting than discussing whether we should 
or should not list planes that win at contest along with the placement of 
the winners, what constitutes a soaring "team" (pilot+plane, pilot+timer, 
timer+plane,pilot+?, etc), or who's the latest dealer to "bash". 

Before we decide that there's nothing good to come of it, let's at least 
try it and see what we find out...Hmmm??? A bit of knowledge might be 
somewhat revealing...
The point is that an unpressurized area of a plane is still not going to be 
at the same pressure as the static pressure outside. The Sundowner is not 
pressurized. The altitude readings when measured from the alternate static 
source in the cabin not only are inaccurate, but the inaccuracy varies with 
things like airspeed, and whether or not a little four-inch-square window 
is open or closed.

I'm sure your device is a very accurate measurer of whatever pressure is 
fed to it. However, trying to measure altitude from the pressure inside the 
fuselage is going to be inconsistent from one flight condition to another, 
and from one airplane to another. Even little things such as the seal of a 
hatch or the taping of the wing roots could alter the numbers. To be really 
useful, the device needs to have a fitting to attach a tube to, and that 
tube needs to run to properly positioned static ports.

It's easy to generate very impressive looking numbers. Generating accurate 
numbers usually requires considerably more work.



Don Stackhouse @ DJ Aerotech
[EMAIL PROTECTED]
http://www.djaerotech.com
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[RCSE] Altitude!

[Charlie Miller]

Good Afternoon!
A friend asked me the other day what I would guess the max altitude with an
open class ship (130 inch wing)
would be.
I say 2000 is spec out. This is comfortable enough to follow! Get your time,
and land.
The other day my friend did a lo-lo flight.. He took it up to a very
uncomfortable altitude. That turned out to be about 2500 feet...
Just the facts Mam! (Dragnet)
Cheers
Charlie


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Re: [RCSE] Altitude braggers

[Simon Van Leeuwen]

Also, amongst other things, the ALTI 2 will definitely (accurately)
record any aircraft's performance which can also be (directly) compared
to any other similarly measured aircraft's flight performance!! 

I suspect that in the future manufacturer claims will include data
showing actual zero-lift (no convective activity) raw data plots. I
wonder who will be the first... 

*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
   Simon Van Leeuwen, Calgary, Alberta
 RADIUS SYSTEMS
Cogito-Ergo-Zoom
  IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
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Fwd: Re: [RCSE] Altitude braggers

[Mark Wales]

27 Aug 1995 I flew my altimeter equiped Windsong to 3740' AGL here in 
central Arkansas.  At one point i lost the plane for 20 - 30 seconds.  That 
does not seem like a long time but it lasted for ever at thsat time.

Mark Wales

Soaring Is Life!!

_
Add photos to your messages with MSN 8. Get 2 months FREE*.  
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RE: [RCSE] Altitude braggers

[Sheldon - YNT uDesign]

Don,
 
While 
I understand what you're saying about the ELV...The ALTi2 Data Logger provides a 
different kind of information for a different situation. Most of my 
customers...Bacus, Meyer, Strother, Glover, etc are using the ALTi2 to gather 
data on their launch profile in order to analyze to enable them to optimize 
their launch technique. The ELV isn't used for the same purpose as you've 
described it.
 
At any 
rate...Use what suits your need and works for you...That, in the end, is usually 
the best tool...YMMV.
 
-Sheldon-
YNT 
uDesign
 
A 
Soaring Nationals Supporter

  -Original Message-From: [EMAIL PROTECTED] 
  [mailto:[EMAIL PROTECTED]Sent: Monday, June 23, 2003 6:45 
  PMTo: [EMAIL PROTECTED]Cc: [EMAIL PROTECTED]; 
  [EMAIL PROTECTED]Subject: Re: [RCSE] Altitude 
  braggersIn a message dated 6/23/2003 You 
  wrote:
  My best flight was 1,600 feet on flight 4.   (Not as 
high as Saturday.)My best launch was 600 ft. on flight 3.Worst 
launch, 1st flight was 538 ft.I love my LoLo.    While this "after the fact data" is interesting and perhaps useful for young guys 
  with good memory, I prefer the instant gratification of ELV that I obtained 
  from Gordy.  It will tell you instantly your launch altitude, record your 
  highest altitude during the flight and give you the familiar tones during the 
  flight.  I find it particularly useful to know my absolute altitude 
  during the flight.  Several times I have guessed that I was higher, only 
  to have the timer report that I had lost several hundred feet in the previous 
  minutes.  Data is recorded in a spiral 
  notebook.   Highest altitude to date 
  is 637 meters or about 2070 feet.  It also showed my launch altitude with 
  my F5J electric sailplane at 1300 feet consistently.  Looks like I need 
  more cells to keep up with Lenny Keer.Don RichmondSan Diego, CA 
  (Albuquerque, NM today)www.hilaunch.com

[RCSE] Altitude Density

[Bill Swingle]

I tend to fly at typically 5000ft ASL and 6800ft ASL. But I also fly at near
sea level occasionally.

Probably due to the light planes that I fly, I have not seen a significant
difference due to the changing air pressure. I've also flown in subfreezing
and 100deg F temperatures at these sites but not seen a real difference.

Has anyone seen an actual difference in altitude density while flying
models?

Bill Swingle
[EMAIL PROTECTED]
Janesville, CA


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